linux-kernel - Re: [RFC 1/3] /dev/low_mem

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Message-ID: <CAOJsxLFdm_vLcuWzzcC==JTpVERuf4XNUOqvRyLt=Q0ixqmx7A@mail.gmail.com>
Date:	Tue, 17 Jan 2012 11:45:06 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	leonid.moiseichuk@...ia.com, kamezawa.hiroyu@...fujitsu.com,
	Rik van Riel <riel@...hat.com>, mel@....ul.ie,
	rientjes@...gle.com, KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ronen Hod <rhod@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC 1/3] /dev/low_mem_notify

On Tue, Jan 17, 2012 at 10:13 AM, Minchan Kim <minchan@...nel.org> wrote:
> This patch makes new device file "/dev/low_mem_notify".
> If application polls it, it can receive event when system
> memory pressure happens.
>
> This patch is based on KOSAKI and Marcelo's long time ago work.
> http://lwn.net/Articles/268732/

I'm not loving the ABI. Alternative solutions:

  - SIGDANGER + signalfd() for poll

  - sys_eventfd()

  - sys_mem_notify_open() similar to sys_perf_event_open()

                        Pekka
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